Glance: how to deal with System 3 devices

Hi,

I have a widget-type app with a glance and would like to make it available also for System 3 devices, which do not support glances.

Right now I get a lot of compiler warnings that the (:glance) annotation is not supported and will be ignored. Right now I am just ignoring the warnings, but is there a better way that avoids the warnings?

Thanks!

Regards, Robert